Improved method of tempeehfg olooe sebutos



W. BARNES.

Tampering Clock Springs.

Patented Nov. 27, 1866.

Witnesses;

lnventon gums rates gaunt @ffi-tt.

IMPROVED METHOD or TEMPEBING GLOGK srnmcs.

SPECIFICATION,

TO ALL WHOM IT. MAY CONCERN:

Be it known thatI, WALLAGE'BARNES, of Bristol, county of Hartford, and State oi Connecticut, have invented certain new and useful improvements in the mode or process of manufacturing Clock Springs; and I do hereby declare that the same is described and represented in the followingspecification and drawings, so as to enable others skilled in the art to produce or make the same therefrom.

' The nature of this improvement will be understood from the specification and drawings. I V The object desired to be attained thereby, is to produce a spring 'from a poorer quality of metal, and, at

the same time, render a spring of given dimensions more effective for use, and more merchantable as an article of trade. And to efiectthis object, the springs are first hardened in the common way. Then, after the hardening process, they are placed between metal plates having their surfaces (oneor both) corrugated or perforated, so as to allow the tempering fluid to flow freely between the coils of the spring and the plates, and immersed in molten lead or its equivalent, for the purpose of drawing the temper, or, in otherwords, for the purpose of producing the required temper to the spring, and also to producea true, even position of the edge of the spring 3 relative to all parts of the coil. The advantage of this operation, or result thereof, is to produce a greater amount of elfective and prolonged action of a spring of equal dimensions, and to avoid the otherwise great amount of friction or obstruction to the mechanism ofa clock, &c., when compared with those now in use.

Then the spring is polished and blued in the ordinary way. After the above is accomplished, a clasp, a, having a sleeve formation, 0, is rivetted to the outer end of the spring, 01, instead of coiling the end thereof, as in the old way. The advantage gainedbythe use of this process will be apparent. The spring can be finished completeits entire length, hardened, tempered, polished, and blued, before the clasp is attached thereto. The clash may be made of any desirable metal, and secured on each side of the end of the spring rivets between the. two parts of the clasp, thus protecting the .end of the spring where it is liable to break or give way, and thereby provide a more perfect sleeve, by means of which it (the spring) is held more perfectly in its desired place. It also produces a more merchantable article. I believe I have thus shown the nature and process whereby Iproduce this improvement. y

What I claim, therefore, and desire to secure by Letters Patent, i s- The mode or process in the manufacturecf springs for clocks, &c., substantially as described.

- WALLACE BARNES. [1,. 8.]

Witnesses:

JEREMY W. BLIss. 

